Metz was an investigative journalist during the Civil Rights Movement. He became famous for his work during the 1964 murders in Neshoba County. He was the first to report that the FBI had several suspects in the killings. In an interview with the Clarion-Ledger in 2000, he said he knew the identity of Mr. X, the man who was said to have been paid $30,000 to tell the location of the bodies of the three victims. He also said that Edgar Ray Killen told him in a conversation twenty years earlier that he and another man cleaned up the murder scene. Metz claims Killen also showed Metz where the victims were buried.